I (as a Bavarian native speaker) notice that Northern Germans when speaking standard German almost consistently use a different stress in composita, which can sound illogical to the Southern German ear. For example "Altersruhesitz" which would be pronounced in the South like "Àltersruhesitz", with a primary stress on the "a" and possibly a secondary stress at the "i", while Northern speakers seem to prefer "Altersrùhesitz" with the stress at the "u" like here at 14:37 . The latter sounds in the Southern ear as if there is a range of things you can have if you are old and one of them is a special "-ruhesitz", while the (in my ears correct) pronunciation "Àltersruhesitz" suggests it's the "-ruhesitz" if you become elderly, as it should be. I could give plenty of other examples for that. The all work in the same way. My main questions would be:
What is the "correct" standard pronunciation (in the "deutsche Bühnensprache", or according the "Ausspracheduden"), and why?
Why do the Southern and Northern variants differ in that respect?
My simple hypotheses would be that in the Northern variants we hear an echo of the Lower German languages which do much less discriminate between lengths and stresses as the Southern variants do and that the southern Variant should be grammatically more correct than the northern one as "Standard German" is a Roofing of the Southern Languages/Dialects.
Curious and grateful about any takes on that!
Some examples :